+0.29 Learnings from 4 months of Image-Video VAE experiments (www.linum.ai S:+0.25 )
125 points by schopra909 5 days ago | 15 comments on HN | Moderate positive Contested Editorial · v3.7 · 2026-02-26 00:57:18 0
Summary Open Science & Knowledge Access Advocates
This technical blog post documents Linum's development of an Image-Video VAE, emphasizing open-sourcing of model code, weights, and experimental logs. The content engages substantively with Articles 19 (free expression and information sharing), 26 (education and technical learning), and 27 (scientific participation), advocating for democratic access to AI research artifacts and transparent methodology in scientific progress.
Article Heatmap
Preamble: +0.18 — Preamble P Article 1: ND — Freedom, Equality, Brotherhood Article 1: No Data — Freedom, Equality, Brotherhood 1 Article 2: ND — Non-Discrimination Article 2: No Data — Non-Discrimination 2 Article 3: ND — Life, Liberty, Security Article 3: No Data — Life, Liberty, Security 3 Article 4: ND — No Slavery Article 4: No Data — No Slavery 4 Article 5: ND — No Torture Article 5: No Data — No Torture 5 Article 6: ND — Legal Personhood Article 6: No Data — Legal Personhood 6 Article 7: ND — Equality Before Law Article 7: No Data — Equality Before Law 7 Article 8: ND — Right to Remedy Article 8: No Data — Right to Remedy 8 Article 9: ND — No Arbitrary Detention Article 9: No Data — No Arbitrary Detention 9 Article 10: ND — Fair Hearing Article 10: No Data — Fair Hearing 10 Article 11: ND — Presumption of Innocence Article 11: No Data — Presumption of Innocence 11 Article 12: ND — Privacy Article 12: No Data — Privacy 12 Article 13: ND — Freedom of Movement Article 13: No Data — Freedom of Movement 13 Article 14: ND — Asylum Article 14: No Data — Asylum 14 Article 15: ND — Nationality Article 15: No Data — Nationality 15 Article 16: ND — Marriage & Family Article 16: No Data — Marriage & Family 16 Article 17: ND — Property Article 17: No Data — Property 17 Article 18: ND — Freedom of Thought Article 18: No Data — Freedom of Thought 18 Article 19: +0.52 — Freedom of Expression 19 Article 20: ND — Assembly & Association Article 20: No Data — Assembly & Association 20 Article 21: ND — Political Participation Article 21: No Data — Political Participation 21 Article 22: ND — Social Security Article 22: No Data — Social Security 22 Article 23: ND — Work & Equal Pay Article 23: No Data — Work & Equal Pay 23 Article 24: ND — Rest & Leisure Article 24: No Data — Rest & Leisure 24 Article 25: ND — Standard of Living Article 25: No Data — Standard of Living 25 Article 26: +0.18 — Education 26 Article 27: +0.66 — Cultural Participation 27 Article 28: ND — Social & International Order Article 28: No Data — Social & International Order 28 Article 29: ND — Duties to Community Article 29: No Data — Duties to Community 29 Article 30: ND — No Destruction of Rights Article 30: No Data — No Destruction of Rights 30
Negative Neutral Positive No Data
Aggregates
Editorial Mean +0.29 Structural Mean +0.25
Weighted Mean +0.39 Unweighted Mean +0.39
Max +0.66 Article 27 Min +0.18 Preamble
Signal 4 No Data 27
Volatility 0.21 (Medium)
Negative 0 Channels E: 0.6 S: 0.4
SETL +0.06 Editorial-dominant
FW Ratio 60% 12 facts · 8 inferences
Evidence 8% coverage
4M 27 ND
Theme Radar
Foundation Security Legal Privacy & Movement Personal Expression Economic & Social Cultural Order & Duties Foundation: 0.18 (1 articles) Security: 0.00 (0 articles) Legal: 0.00 (0 articles) Privacy & Movement: 0.00 (0 articles) Personal: 0.00 (0 articles) Expression: 0.52 (1 articles) Economic & Social: 0.00 (0 articles) Cultural: 0.42 (2 articles) Order & Duties: 0.00 (0 articles)
HN Discussion 6 top-level · 3 replies
schopra909 2026-02-24 19:00 UTC link
Hi HN, I’m one of the two authors of the post and the Linum v2 text-to-video model (https://news.ycombinator.com/item?id=46721488). We're releasing our Image-Video VAE (open weights) and a deep dive on how we built it. Happy to answer questions about the work!
lastdong 2026-02-25 22:13 UTC link
This seems like a great model to experiment fine tuning with original art, given it’s relatively small and with open license. Is that a fair assessment?

Thanks for the great write up and making it available to us all.

DonThomasitos 2026-02-25 22:47 UTC link
Nice summary! I missed the mention of EQ-VAE when it comes to generation quality. Tiny trick, huge impact! Have you tried it?
greatgib 2026-02-25 23:13 UTC link
Very nice well written article!

The kind that I like so much on HN. It tickle your mind but is still clear enough for an advanced beginner.

asaiacai 2026-02-25 23:20 UTC link
its cool to see the iterative improvements to your model laid out, but for everything that workedm i imagine there were at least a million other things you also tried but didnt work out. whats your process of trying these different techniques/architectures? do you just wait for one experiment to finish and visually inspect the results everytime. seems hard since these take a while to train. how do you shorten the feedback loop in this space?
pwillia7 2026-02-25 23:41 UTC link
This is very cool thanks for sharing
schopra909 2026-02-25 22:22 UTC link
yep, Apache 2.0! so anyone's welcome to download and hack away
selridge 2026-02-25 23:08 UTC link
No questions but I appreciate the write-up! Thank you for sharing.
schopra909 2026-02-25 23:08 UTC link
Hadn’t seen that before! Seems very in line with what with the broader points about regularization. In table 4 they show faster convergence in 200 epochs when used alongside REPA. I’d be curious to see if it ended up beating REPA by itself with full 800 epochs of training — or if something about this new latent space, leads to plateauing itself (learns faster but caps out on expressivity). We’ve seen that phenomena before in other situations (eg UNET learns faster than DiT because of convolutions, but stops learning beyond a certain point).
Editorial Channel
What the content says
+0.45
Article 27 Cultural Participation
Medium Advocacy Framing
Editorial
+0.45
SETL
+0.21

Content strongly advocates for participation in scientific advancement and cultural life through transparent research publication and open knowledge sharing.

+0.35
Article 19 Freedom of Expression
Medium Advocacy Framing
Editorial
+0.35
SETL
-0.14

Content demonstrates commitment to free expression and information sharing by openly publishing technical research, methodology, code, and experiment logs.

+0.20
Preamble Preamble
Medium Advocacy
Editorial
+0.20
SETL
+0.10

Content advocates for open-sourcing AI research and democratizing access to technical knowledge and model artifacts.

+0.15
Article 26 Education
Medium Advocacy
Editorial
+0.15
SETL
+0.09

Content promotes access to technical education and scientific knowledge through open-sourcing research artifacts and detailed explanatory documentation.

ND
Article 1 Freedom, Equality, Brotherhood

Not engaged. Content does not address equal and inalienable rights of humans.

ND
Article 2 Non-Discrimination

Not engaged. Content does not address non-discrimination.

ND
Article 3 Life, Liberty, Security

Not engaged. Content does not address security of person.

ND
Article 4 No Slavery

Not engaged. Content does not address slavery or servitude.

ND
Article 5 No Torture

Not engaged. Content does not address torture or cruel treatment.

ND
Article 6 Legal Personhood

Not engaged. Content does not address right to recognition as person.

ND
Article 7 Equality Before Law

Not engaged. Content does not address equal protection before the law.

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Article 8 Right to Remedy

Not engaged. Content does not address effective remedies for rights violations.

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Article 9 No Arbitrary Detention

Not engaged. Content does not address arbitrary arrest or detention.

ND
Article 10 Fair Hearing

Not engaged. Content does not address fair trial or due process.

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Article 11 Presumption of Innocence

Not engaged. Content does not address criminal proceedings or presumption of innocence.

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Article 12 Privacy

Not engaged. Content does not address privacy, family, home, or correspondence.

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Article 13 Freedom of Movement

Not engaged. Content does not address freedom of movement or residence.

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Article 14 Asylum

Not engaged. Content does not address asylum or right to nationality.

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Article 15 Nationality

Not engaged. Content does not address right to nationality or its change.

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Article 16 Marriage & Family

Not engaged. Content does not address marriage or family.

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Article 17 Property

Not engaged. Content does not address property rights.

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Article 18 Freedom of Thought

Not engaged. Content does not address freedom of thought, conscience, or religion.

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Article 20 Assembly & Association

Not engaged. Content does not address freedom of assembly or association.

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Article 21 Political Participation

Not engaged. Content does not address political participation or democratic governance.

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Article 22 Social Security

Not engaged. Content does not address social security or social services.

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Article 23 Work & Equal Pay

Not engaged. Content does not address work, employment, or labor rights.

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Article 24 Rest & Leisure

Not engaged. Content does not address rest, leisure, or reasonable working hours.

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Article 25 Standard of Living

Not engaged. Content does not address health, food, clothing, housing, or medical care.

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Article 28 Social & International Order

Not engaged. Content does not address social and international order.

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Article 29 Duties to Community

Not engaged. Content does not address duties to community or limitations on rights.

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Article 30 No Destruction of Rights

Not engaged. Content does not address prohibition of destruction of rights.

Structural Channel
What the site does
+0.40
Article 19 Freedom of Expression
Medium Advocacy Framing
Structural
+0.40
Context Modifier
+0.15
SETL
-0.14

Site provides unrestricted public access to model code and weights; open-source architecture removes barriers to accessing and disseminating technical information.

+0.35
Article 27 Cultural Participation
Medium Advocacy Framing
Structural
+0.35
Context Modifier
+0.25
SETL
+0.21

Open-source release of code and weights enables broad participation in scientific progress and technical innovation; transparent methodology supports scientific culture.

+0.15
Preamble Preamble
Medium Advocacy
Structural
+0.15
Context Modifier
0.00
SETL
+0.10

The site provides downloadable model code and weights, enabling knowledge sharing and reducing gatekeeping of technical resources.

+0.10
Article 26 Education
Medium Advocacy
Structural
+0.10
Context Modifier
+0.05
SETL
+0.09

Basic accessibility features present (alt text for images); open-source model access removes economic barriers to technical learning.

ND
Article 1 Freedom, Equality, Brotherhood

Not observable in structural context.

ND
Article 2 Non-Discrimination

Not observable in structural context.

ND
Article 3 Life, Liberty, Security

Not observable in structural context.

ND
Article 4 No Slavery

Not observable in structural context.

ND
Article 5 No Torture

Not observable in structural context.

ND
Article 6 Legal Personhood

Not observable in structural context.

ND
Article 7 Equality Before Law

Not engaged. Content does not address equal protection before the law.

ND
Article 8 Right to Remedy

Not observable in structural context.

ND
Article 9 No Arbitrary Detention

Not observable in structural context.

ND
Article 10 Fair Hearing

Not observable in structural context.

ND
Article 11 Presumption of Innocence

Not observable in structural context.

ND
Article 12 Privacy

Not observable in structural context.

ND
Article 13 Freedom of Movement

Not observable in structural context.

ND
Article 14 Asylum

Not observable in structural context.

ND
Article 15 Nationality

Not observable in structural context.

ND
Article 16 Marriage & Family

Not observable in structural context.

ND
Article 17 Property

Not observable in structural context.

ND
Article 18 Freedom of Thought

Not observable in structural context.

ND
Article 20 Assembly & Association

Not observable in structural context.

ND
Article 21 Political Participation

Not observable in structural context.

ND
Article 22 Social Security

Not observable in structural context.

ND
Article 23 Work & Equal Pay

Not observable in structural context.

ND
Article 24 Rest & Leisure

Not observable in structural context.

ND
Article 25 Standard of Living

Not observable in structural context.

ND
Article 28 Social & International Order

Not observable in structural context.

ND
Article 29 Duties to Community

Not observable in structural context.

ND
Article 30 No Destruction of Rights

Not observable in structural context.

Supplementary Signals
How this content communicates, beyond directional lean. Learn more
Epistemic Quality
How well-sourced and evidence-based is this content?
0.72 medium claims
Sources
0.7
Evidence
0.7
Uncertainty
0.8
Purpose
0.8
Propaganda Flags
No manipulative rhetoric detected
0 techniques detected
Emotional Tone
Emotional character: positive/negative, intensity, authority
measured
Valence
+0.3
Arousal
0.4
Dominance
0.6
Transparency
Does the content identify its author and disclose interests?
0.40
✗ Author
More signals: context, framing & audience
Solution Orientation
Does this content offer solutions or only describe problems?
0.64 mixed
Reader Agency
0.7
Stakeholder Voice
Whose perspectives are represented in this content?
0.50 2 perspectives
Speaks: institution
About: individualscommunity
Temporal Framing
Is this content looking backward, at the present, or forward?
mixed short term
Geographic Scope
What geographic area does this content cover?
unspecified
Complexity
How accessible is this content to a general audience?
technical high jargon domain specific
Longitudinal 1132 HN snapshots · 12 evals
+1 0 −1 HN
Audit Trail 32 entries
2026-02-28 14:22 eval_success Lite evaluated: Neutral (0.00) - -
2026-02-28 14:22 eval Evaluated by llama-3.3-70b-wai: 0.00 (Neutral)
reasoning
Technical content no rights stance
2026-02-28 14:22 model_divergence Cross-model spread 0.56 exceeds threshold (4 models) - -
2026-02-26 23:19 eval_success Light evaluated: Neutral (0.00) - -
2026-02-26 23:19 eval Evaluated by llama-4-scout-wai: 0.00 (Neutral)
2026-02-26 20:26 dlq Dead-lettered after 1 attempts: Learnings from 4 months of Image-Video VAE experiments - -
2026-02-26 20:24 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 20:23 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 20:22 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 17:47 dlq Dead-lettered after 1 attempts: Learnings from 4 months of Image-Video VAE experiments - -
2026-02-26 17:45 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 17:44 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 17:43 rate_limit OpenRouter rate limited (429) model=llama-3.3-70b - -
2026-02-26 14:39 eval_success Evaluated: Moderate positive (0.56) - -
2026-02-26 14:39 eval Evaluated by deepseek-v3.2: +0.56 (Moderate positive) 8,564 tokens
2026-02-26 09:19 dlq Dead-lettered after 1 attempts: Learnings from 4 months of Image-Video VAE experiments - -
2026-02-26 09:19 dlq Dead-lettered after 1 attempts: Learnings from 4 months of Image-Video VAE experiments - -
2026-02-26 09:18 rate_limit OpenRouter rate limited (429) model=mistral-small-3.1 - -
2026-02-26 09:17 rate_limit OpenRouter rate limited (429) model=hermes-3-405b - -
2026-02-26 09:17 rate_limit OpenRouter rate limited (429) model=mistral-small-3.1 - -
2026-02-26 09:16 rate_limit OpenRouter rate limited (429) model=hermes-3-405b - -
2026-02-26 09:15 rate_limit OpenRouter rate limited (429) model=hermes-3-405b - -
2026-02-26 09:15 rate_limit OpenRouter rate limited (429) model=mistral-small-3.1 - -
2026-02-26 00:57 eval Evaluated by claude-haiku-4-5-20251001: +0.39 (Neutral) 9,787 tokens -0.20
2026-02-26 00:33 eval Evaluated by claude-haiku-4-5-20251001: +0.58 (Moderate positive) 9,747 tokens +0.29
2026-02-26 00:05 eval Evaluated by claude-haiku-4-5-20251001: +0.29 (Mild positive) 10,070 tokens -0.15
2026-02-25 23:30 eval Evaluated by claude-haiku-4-5-20251001: +0.44 (Moderate positive) 9,594 tokens +0.01
2026-02-25 23:19 eval Evaluated by claude-haiku-4-5-20251001: +0.43 (Moderate positive) 9,995 tokens +0.01
2026-02-25 22:58 eval Evaluated by claude-haiku-4-5-20251001: +0.42 (Moderate positive) 9,736 tokens -0.03
2026-02-25 22:35 eval Evaluated by claude-haiku-4-5-20251001: +0.45 (Moderate positive) 6,909 tokens -0.04
2026-02-25 22:12 eval Evaluated by claude-haiku-4-5-20251001: +0.49 (Moderate positive) 7,020 tokens -0.08
2026-02-25 21:59 eval Evaluated by claude-haiku-4-5-20251001: +0.57 (Moderate positive) 6,661 tokens